The correct answer is option 1: Mitochondria.

Mitochondria are treated as prokaryotic cells within eukaryotic cells because they exhibit some characteristics of prokaryotic cells. Prokaryotic cells are simpler and do not have a nucleus or membrane-bound organelles. Mitochondria have their own DNA and can replicate independently from the rest of the cell, similar to prokaryotes. They also have a double membrane, similar to the cell membrane of prokaryotes. This suggests that mitochondria were once free-living prokaryotic cells that were engulfed by a eukaryotic cell in a process called endosymbiosis.

Golgi bodies (option 2), lysosomes (option 3), and glyoxysomes (option 4) are not treated as prokaryotic cells within eukaryotic cells. Golgi bodies are responsible for packaging and modifying proteins, lysosomes are involved in cellular digestion, and glyoxysomes are found in plants and are involved in converting stored fats into sugars. These organelles are formed within the eukaryotic cell and are not reminiscent of prokaryotic cells.